Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Lithium salts are hydrated.

Reason (R) : Lithium has higher polarising power than other alkali metal group members.

In the light of the above statements, choose the most appropriate answer from the options given below :

The major component/ingredient of Portland Cement is :

Choose the correct statement from the following :

The number of water molecules in gypsum, dead burnt plaster and plaster of Paris, respectively are :